<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="文章详情" @click-left="$router.back()">
    </van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="loading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{article.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{article.aut_name}}</div>
          <div slot="label" class="publish-date">{{article.pubdate | relativeTime}}</div>
          <!-- 关注用户组件 -->
          <!-- 模板中的事件参数是$event -->
          <follow-user class="follow-btn" :isFollow="article.is_followed" :user-id="article.aut_id"
            @updata_is_followed="article.is_followed = $event" />
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" v-html="article.content" ref="articleRef"></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论列表 -->
        <article-comment :source="article.art_id" @onload-success="commentCount = $event"
          :list="commentList" />
        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button class="comment-btn" type="default" round size="small"
            @click="showCommentPopup = true">写评论</van-button>
          <!-- 评论总数 -->
          <van-icon name="comment-o" :badge="commentCount" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <!-- 收藏 -->
          <collect-article v-model="article.is_collected" :article-id="article.art_id" />
          <!-- 点赞 -->
          <!-- <van-icon color="#777" name="good-job-o" /> -->
          <like-article v-model="article.attitude" :article-id="article.art_id" />
          <!-- 分享 -->
          <van-icon name="share" color="#777777" @click="showShare = true"></van-icon>
          <van-share-sheet v-model="showShare" title="立即分享给好友" :options="options"
            @select="onSelect" />
        </div>
        <!-- /底部区域 -->
        <!-- 评论弹出层 -->
        <van-popup v-model="showCommentPopup" position="bottom">
          <comment-post :target="article.art_id" @post-success="onPost" />
        </van-popup>
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus == 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticleInfo()">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
  </div>
</template>

<script>
import { getArticleInfo } from '@/api/article';
import { ImagePreview } from 'vant'; // 引入图片预览组件
import FollowUser from '@/components/follow-user';
import CollectArticle from '@/components/collect-article';
import LikeArticle from '@/components/like-article';
import ArticleComment from './components/article-comment';
import CommentPost from './components/comment-post';
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    ArticleComment,
    CommentPost,
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  data() {
    return {
      article: '',
      loading: true, // 加载中
      errStatus: '', // 加载状态
      followLoading: false, // 按钮加载状态
      showShare: false,
      options: [
        [
          { name: '微信', icon: 'wechat' },
          { name: '朋友圈', icon: 'wechat-moments' },
          { name: '微博', icon: 'weibo' },
          { name: 'QQ', icon: 'qq' },
        ],
        [
          { name: '复制链接', icon: 'link' },
          { name: '分享海报', icon: 'poster' },
          { name: '二维码', icon: 'qrcode' },
          { name: '小程序码', icon: 'weapp-qrcode' },
        ],
      ],
      commentCount: 0, // 评论总数
      showCommentPopup: false, // 展示评论弹出层
      commentList: [], // 评论列表
    };
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticleInfo();
  },
  mounted() {},
  methods: {
    onPost(data) {
      this.showCommentPopup = false;
      console.log(data);
      this.commentList.unshift(data.new_obj);
      this.commentCount ++
    },
    onSelect(option) {
      this.$toast(option.name);
      this.showShare = false;
    },
    async loadArticleInfo() {
      this.loading = true;
      // 写法一
      getArticleInfo(this.articleId)
        .then((res) => {
          // 模拟请求失败
          // if(Math.random() > 0.5) {
          //   JSON.parse('xneiwhfe')
          // }
          this.article = res;
          // 初始化图片预览
          setTimeout(() => {
            console.log(this.$refs.articleRef);
            this.imagePreview();
          }, 0);
          this.loading = false;
        })
        .catch((err) => {
          console.log(err);
          if (err.response && err.response.status == 404) {
            this.errStatus = 404;
          }
          this.loading = false;
        });
      // 写法二
      // try {
      //   // 模拟请求失败
      //   // if(Math.random() > 0.5) {
      //   //   JSON.parse('xneiwhfe')
      //   // }
      //   this.article = await getArticleInfo(this.articleId);
      // } catch (err) {
      //   console.log(err);
      //   if(err.response && err.response.status == 404) {
      //     this.errStatus = 404
      //   }
      // }
      // this.loading = false;
    },
    // 图片预览
    imagePreview() {
      const articleContent = this.$refs.articleRef;
      const imgs = articleContent.querySelectorAll('img');
      console.log(imgs);
      // 获取所有的img地址
      const images = [];
      imgs.forEach((img, index) => {
        images.push(img.src);
        img.onclick = () => {
          ImagePreview({
            images,
            startPosition: index,
          });
        };
      });
    },
  },
};
</script>

<style scoped lang="less">
// 引入第三方文章格式文件
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
